Tìm x biết 

D

- Hướng dẫn giải

Đáp án D

$$\begin{gathered} \left|\frac{3}{4}x-\frac{3}{5}\right|-\frac{1}{2}=0 \\ \left|\frac{3}{4}x-\frac{3}{5}\right|=\frac{1}{2} \end{gathered}$$

TH1 :

 $$\begin{gathered} \frac{3}{4}x-\frac{3}{5}=\frac{1}{2} \\ \frac{3}{4}x=\frac{11}{10} \\ x=\frac{22}{15} \end{gathered}$$

TH2:

$$\begin{gathered} \frac{3}{4}x-\frac{3}{5}=\frac{-1}{2} \\ \frac{3}{4}x=\frac{1}{10} \\ x=\frac{2}{15} \end{gathered}$$